Square fan grille



FIG. 1 is a perspective view of a square fan grille;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines illustrate portions of the square fan grille and form no part of the claimed design. 

CLAIM The ornamental design for a square fan grille, as shown and described. 